PLEASANT HILL, Calif. (KGO) -- Three earthquakes struck Contra Costa County within the span of 15 minutes this afternoon, according to the U.S. Geological Survey.
The first earthquake recorded at 3:01 p.m. had a preliminary magnitude of 2.5 and had a depth of 8 miles, USGS officials said.
The quake was in an area 1 mile south of Concord, 2 miles northeast of Pleasant Hill and 4 miles north-northeast of Walnut Creek, USGS officials said.
A second temblor with a preliminary magnitude of 4.0 that struck in the same area as the first one has been downgraded to a magnitude of 3.6.
The third quake occurred a minute later with a preliminary magnitude of 2.7 and a depth of 8.1 miles in the same region, USGS officials
Click here for a look at the latest quakes to hit the Bay Area.
Stay with ABC7 News for the latest details on this developing story.
ABC7 News contributed to this story.